Soda fountain



June 23, 1931.

vF. l. RAYMOND 1,811,806

S ODA FOUNTAI N sind March 1a. 1929 4 sheetsneet 1 Y l l lllllllll lill Ju'ne 2.3, 1931. F. l. RAYMOND 1,811,805

' soDA FOUNTAIN Filed March 18, 1929 4 sheets-sheet 2 z? i M @wfg June 23, 1931. F. RAYMOND 1,811,806

som FOUNTAIN Filed March l18, 1929 4 Sheets-Sheet 5 Imr? Tredf/mmd a; m E12 June 23, 1931. F, 1 RAYMQM; 1,811,806

SODA FOUNTAIN v Filed March 18. 1929 4 Sheets-Sheet 4 Patented June 23, 1931- UNITED STATES FRED I. RAYMOND, F RIVER FORESTJ ILLINOI sona Florrnrsm 4'.^.pp1if..fm m mea March 1s, 1929. serial No. 347,947.-

y This invention relates to soda fountains, orl

similar refrigerating apparatus, and more particularly to new and improved mechanism tor automatically and simultaneously/main- 5 taining diii'erentv selected temperatures in different compartments or portions of the apparatus. u In the modern soda ountainfit is often de- .sirable that several different temperatures, all below the prevailing atmospheric temperature, be maintained in different portions of the fountaim'for example in the compartment for storing brick ice cream, the compartment for storing bulk ice cream, the compartment or tank for cooling the soda and the drinking water, the compartment where the Syrups are stored, and the general storage compartment for bottled Itis especially di cult to maintain the soda and drinking water at the substantially constant and proper temperature, dueto the fact that the cooled supply of these liquids is being intermittently drawn upon in varying amounts.

According to the presentinvention, the coolers or coils through which the soda or l' drinking water pass, are positioned in a tank contanmg refrigerating brine. The temperature of this brine is maintained either by controlling the flow of the brine itself into and out of the tank, or by placing the controlled refrigerating element wlthin the brine in the tank. Thermostatie means is provided for controlling the flow of either the brine or the refrigerating fluid which cools the brine, and this thermostatic means 'is re-l sponsive simultaneously to both vthe temperature of thewater or soda inthe coolers, and also the temperature of the brine in the tank. 40 The invention also contemplates a refrigerating apparatus provided with a boiler or other refrigerating element or group of such elements in only that compartment wherein the lowest temperaturel is to be'maintained,

the -ow of brine or similar cooling fluid from this main compartment to and'back from the g other compartments of the soda fountain. The general object of this invention is to oods and similar articles.

the desired ltemperatures in the other compartments being maintainedv by controlling provide a'- new and improved refrigerating system for soda fountains or similar apparatus, substantially as referred to hereinabove and as described more in detail in the specivications which follow. 55

Another object is to provide a system embodying automatic means for controlling the temperature of a cooling medium in response to the simultaneous and cumulative temperature changes in the medium itself and also in the liquid that is being cooled by this medium.

' Another object is toprovide an improved soda fountain that will automatically and simultaneously maintain a plurality of dierent temperatures in the severaldiierent compartments thereof.

Another object is to provide improved me'ans for positively maintaining a circulation of brine in the several cooling tanks. 70

Another object is to provide improved means for maintaining a circulation of brine through a thermo-Siphon coil used for cooling one of the compartments ofv the fountain. 75

Other objects and advantages of this invention will be more apparent from the following detailed description ofV certain approved forms of apparatus operating accordmg to the principles of this invention.

In the accompanying drawings:

1 is a view, partially in e evation, and partially in vertical section., of a soda fountain,- showing diagrammatically the coolingsystem therefor. 85

Fig. 2' is an enlarged vertical section showing one form' of thermostatically controlled valve-operating mechanism.

Fig. 3 is a similar view showing a diierent form of thermostatic mechanism.

Fig. 4 isa plan view of one of the coolers.

Fig. 5 isa section through one of the vcoolers showing a different form of bulb-mechamsm. v

Fig. 6 is a similar view through a pair of 95 coolers, showing thermostatic bulbs connected in multiple. p y

Figs. 7, 8, 9 and 10 are partial vertical sections showing modiied forms of the refrigerating apparatus. 10

and ice water respectively. Certain of thewalls of th`e soda fountain may be made double as indicated at 7 and 8, the space between being lled with insulating material 9. It is to be understood that the refrigerating apparatus and the fluid and electric circuits are illustrated diagrammatically, and not in the size, relative proportions and exact locations, that would be found in an actual construction.

A main compartment or tank 10 is adapted to be filled with brine in which is positioned a receptacle or freezer 11 for holding brick ice cream. Access to this receptacle is through an opening in the top 2 of the fountain. It is desirable that the temperature in this tank or. compartment 10 be kept quite low, for example from 0 to 5 Fahrenheit.v

Within the brine i'n this compartment 10 is positioned some suitable form of refrigerating element, such as the boiler shown at 12. Thls boiler is in the form of a coil or assemblage 'of grouped tubular members in whicha .compressed and liquefied material 4 admittedthrough the inlet supply pipe 13 expands and vaporizes, the gas passing out through ipe 14. The process of expansion. of this refrigerating medium serves to absorb heat from the brine in tank 10, in a well known manner.` A temperature regulating control valve 15 in su'pply pipe 13 serves to limit the Afiow of the refrigerating medium to the boiler and thus regula-tes the temperature that is maintainedin the brine' tank 10. It is to be understood that the refrigerating element just described isshown by way of example, and that any other form of refrigerating means might be used for maintaining the brine in tank 10 t the proper temperature.

It is to be understood that the term boiler as used in the following description and in the claims is intended to designate any equivalent form of refrigerating element for keeping the brine or other Huid in the tank at the proper low temperature.-

A second compartment or brine tank 16 positioned adjacent the main tank 10 is adapted to house one or more freezers 17 for hqlding bulk ice cream. The temperature in th1s compartment should be somewhat higher than in compartment 10, for examplerfrom 10 to 12 Fahrenheit. A return port or passage '18 is formed in the wall 19 separating the tanks 10 and 16, and the brine that Hows back into tank 10 from tank 16 throughthe passage 18 is deflected upwardly by the baiile plate 20. s

An auxiliary brine tank 21 for cooling the soda and drinking water is positioned at one side of or in one corner of the large compartment 22 which is used for general lstorage purposes. The soda and plain water that are 'refrigerated by the -brine tank- 21 should be kept at a temperature 4of from 33 lto 40 Fahrenheit, whereas a temperature of from 40 to 45 Fahrenheit is'proper in therefrigerat-ing compartment 22. This compartmentl 22 is cooled by conduction from the brine tank 21 positionedV therein. Positioned within the brine tank 21 are two similar but separate coolers -23 and 24 through which the soda and plain water respectively are circulated. The soda flows in through pipe 25 from the source of Supply so as to replenish the soda drawn off from the cooler 23 through pipe 26 leading to the'draft arm 5,. Similarly, the plain water flows in through pipe 27 to cooler 24, and is drawn off from the cooler through pipe 28 leading to the faucet or draft arm 6.v The coolers'23 and 24 may be of the general construction illustrated in Fig. 4`, consisting of av plurality of tubes or cylinders 29 connected by .end heads 30.

Theupper compartment 31 in which thev syrup dispensers 4 are positioned, need not be kept at as low a temperature but will be from 20 to 30 under the room temperature.

The mechanism for maintaining these different temperatures in the different compartments of the fountain will now be described. A pipe or conduit 32 leads from the lower portion of brine tank 10 to a pump 33 constantly driven by a small electric motor 34.

l The brine drawn from tank 10 through conduit 32 is forced by pump 33 through a con- -duit 35 having branches 36 and 37 leading respectively to the two similar two-way valves 38 and 39. One of these valves is indicated in vertical sectionin Figs. 2 and 3, and comprises an inlet passage 40 leading to a central chamber 41 from which lead an upper outlet passage 42 and a lower outlet passage 43. A ball Valve 44 is adapted to alternatively close one or the other of the passages 42 and 43, the movable valve member having a stem 45 leading to the core 46 of a solenoid .47. When the solenoid 47 is deenergized, the valve 44 will be lowered so as toclose Vthe lower Voutlet passage 43 and `open the upper outlet passage 42. Whenthe solenoid 47 its energized, the valve 44 will be raised to close the upper passage 42 and open the lower passage 43. The other valve 39 is of exactly similarconstruction and is similarly controlled by a solenoid 48. The"upper outlet passages 42 of each Valve connect with a return conduit 49 which leads back to the upper portion of brine tank 10. Therefore, when both valves are in their'low'ered positions, all of the'brine withdrawn `from tank 10 through conduit 32 will be forced back into the upper portion of tank through the return conduit 49. 'Although no brine is being supplied at this timeu to either of the tanks 16 or 21, the forced circulation of brine to and from tank 10 through the conduits 32 and 49 will serve a useful purpose by keeping the brine solution in motion so as to prevent'the salts from settling out to the bottom of tank 10.

A brine conduit 50 leads from the lower A outlet43 of valve 39 into the upper end of the secondary brine tank 16. A thermostatic mechanism comprises a bulb 51 positioned within the brine in tank 16 and connected by tube 52 with an expansible and contractible element 53, here shown in the form'ofa Bourvdon tube having one end anchored and the other end adapted to open and close a switch 54 positioned in the operating circuit of the solenoid 48. Switch 54 will normall be open and the solenoid 48 deenergized. ince no refrigerating element such as 12 isplaced directly within' the brine in tank-16, this brine willassume a somewhat higher temperature than the brine in .tank 10.- When a certain temperature has been reached, the expansible or vaporized thermostatic lud in the bulb 51 and tube 53 will expandso that the tube 53 will tend to uncoil and thus close the switch 54 and complete the circuit energizing the solenoid 48. Brine will now be forced byl pump' 33 through conduit 37,valve 39 and conduit 50 into the tank 16, to replace brine that Hows from tank 16 through 4passage 18 back into the main brine tank 10. The brine in tank 16 will thus be replaced by brine at a lower temperature drawn from the main tank 10, and when the desired low temperature has' been reestablished in secondary tank 16, the thermostatic elements will open the switch 54 thus deenergizing the solenoid 48 v and lowering the valve 44 so as to cut oi the flow of brine to tank 16., l i y In a similar manner, a conduit 55 lleads from lower outlet 43 of valve 38 into-the.-

auxiliary tank 21, and a return conduitl 56 leads from the lower portion of this auxillary tank into the main return' conduit 49 and thence b'ack into tank 10. When solenoid 47 is ener ized andthe ball valve 44-.raised,

'therelwlllbe a circulation of brine from tank 10 intoand through-the auxiliary tank 21 and thence back through return conduits .56 and 49 to tank 10. When suiiicient of the brine in tank 21 has been replaced by colder brine from tank 10, the solenoid 47 will be deenergized and the iow of brine into tank 21 through conduit 55 will be cut off.l Due to the variable rate at which soda or plain water is withdrawn from the coolers 23 and i 24, the proper temperature of these liquids cannot be accurately maintained bymerely keeping the brine within tank 21 at a subture changes. comprises. Bourdon tube A63, bulb 64, and

s tantially constant temperature, as is suiiicient in the secondary tank 16. If the liquidL in the coolers is rapidly withdrawn and hence Atank 21 is made of relatively small volume so that the brine therein may be rapidly replaced by a colder brine, and a ldual thremostatic control is utilized that is responsive to the temperature condition of both the liquid in the coolers and also the temperature of the brine inj tank 21. For this purpose an instrumentl is utilized of the-type disclosed and claimed in my copending applications Serial No. 244,225, filed January 3,

1928, and Serial No.'313,493, filed October 19, 1928. Two different types of apparatus suitable for this purpose are disclosed in ,Figs 2 and `3 of the drawings.' Referring first to Fig. 2, a Bourdon tube 57 has its openA end-58 anchored within the casing 59, this open end 58 being connected through tube 60 with the bulb 61. The bulb and Bourdon tube contain a thermostatic fluid which expands when heated. The closed inner end of ltube 57 -is connected with crank arm 62 `which will be oscillatedas tube 57 y tends to coil or uncoil in accordancewith tempera- A similar thermostatic unit crank arm- 65, ywhich is oscillated in accordance with changes in temperature of the -medium inv which bulb 64 is placed. The

crank arms 62 and 65 are connected through links 66 and'67 respectively with the ends of a. floating link 68, which in turn is connected through link 69 with a lever 70 which carries throu h clip 71 the tube 72 of a mercury switch. mercury globule 73 in tube 72 is `adapted to bridge two spaced contacts 74 and 75 in one end of tube 72, when the tube is tilted in the proper direction. When the tube is tiltedin the other dircoton the mercury globule will runto the other end of the tube vand break the\ circuit. The ulcrum 76' of lever 70 may be adjustably positioned in any one of a. plurality of openings 77 in a bracket 78, and in a similar manner the upper'end 79 of link69 may be connected in any one of a plurality of openingsSO in the floating link 68. It will be. apparent that the cumulative eiect of the oscillations of the two crank arms 62 and 65 due to the movements ofthe two thermostatic units, will be imparted'to the ioating link 68 and thence through link 69 to the lever operated switch.I

,If link V69 were connected to theexact center two thermostatic units, as applied te theI switch operating mechanism, can be varied. The contacts 74 and- 75 of the mercury switch are connected by flexible wires 81 and 82 to the binding posts 83 and 84 which are connected in the operating circuit for soleg()V IiOid 4:7.

ln the alternative form -of mechanism shown in Fig. 3, the bulbs 61 and 64 are con-4 nected through tubes 85 and 86 with a single thermostatie coil oreBourdon tube 87, the :5 free end of which is adapted to actuate the arm or pointer, 88 which carries one switch contact 89. An adjustable arm or pointer 90, movable over an index scale 91 carries the otherswitch contact 92. The bulbs 61 30 and 64 and the thermostatie coil 87 are all in open communication with one another through connecting tubing so that an expansion of the thermostatic fluid in one bulb 61 might be just counteracted-by a-contraction of the fluiduin bulb 64 and no'movement would be i arted to coil 87. The expansion or contraction of coil 87 will always represent the net or algebraiesum of the teinperature responsive movements of the fiuids 40 in the two bulbs 61 and 64. The temperature at which the switch will be closed m'ay be adjusted by moving arm -90 along the index` scale 91. As a result of a sufficient rise in temperature, the contacts 89 and 92 will be 35 brought together s as to close theoperating circuit of solenoid 47 and lift the valve member 44, as illustrated in Fig. 3.

The thermostatic bulb 6l is placed in the brine in auxiliary tank 21, and the other bulb 50 64 is placed within one of the coolers 23 or 24. As shown in Fig. 1, it is placed within the clear water cooler. It could alternatively be placed within the soda cooler, or separate bulbs such as 64a' and 64b (Fig. 6) could be 5 placed in each of the coolers 23 and-24, the tubes leading from these bulbs beingeonnected, as at 93, 94'and 95 toa single tube leading to the thermostat coil. This is the Same as n Adividing'the bulb 64 into two parts, one in each of the coolers, so that the responsive temperature will be that of the average of the liquid in the coolers. The bulb 64-might be placed in one of the intermediate tubes of the cooler, as in Figs. `f1 and, or may be elongated as indicated at 64o in Fig. to l extend through one of the connecting heads, or through a plurality'of the tubes.

v It will now be apparent that the control of valve 38 for admitting new refrigeratedbrine to tank 21 is dependent not only on the temperature of the brine in the tank but alsovon the temperature of the liquid in the coolers. The brine in tank 21 maybe sufficiently cold to maintain the desired temperature in the coolers when no liquid is -being withdrawn therefrom, but assuming that there has been a steady withdrawal of soda or 'water from the coolers so that warmer liquid has flowed in from the source of supply, it, is desirable that the temperature of the brine in tank 21 be lowered considerably to quickly cool this new supply of liquid in the coolers. Under such circumstances, the bulb 64 in" the cooler will react, through the thermostatic fluid therein, to cause the valve member 44 in valve 38 to be elevated, so that brine from tank 10 will be pumped through Conduit into auxiliary tank 21, the warmerbrine being forced out through conduit 56 I and return conduit 49 backito the upper portion of tank 10. Since Itank 21 is of relatively small volume, preferably ,holding about the same volume of brine as the volume of liquid inthe coolers, the brine thereinwill be quickly replaced by much colder brine so that the new supply of liquid in the coolers will have its temperature quickly lowered to the desired point. The valve 38 will be operated to cut ofi the fiow of new brinel into tank 21, and the 'temperature of the brine in tank 21 may be ermitted to raise considerably before new rin'e is admitted, so long as its temperature is adequate to maintain the liquid in the coolers at the desired low temperature. In other words, when the liquid in the coolers is at the proper temperature, the brine in tank 21 \may be permitted to rise in temperature to .approximately the same temperature as that in the coolers,but when' considerable liquid is being Withdrawn from the coolers, the temperature of the brine in tank 21 must be lowered so as to provide a medium for cooling theinew liquid admitted to the coolers. The simultaneous and dual control of the two thermostatic elements 61 and 64 operate to maintain a practically continuous supply of soda and water at the deslred temperature. Another reason for having tank 21 of relatively small Volume is to avoid the possibility of freezing the water in the coolers. Ifthe flow of water through the `coolers is abruptly stopped,.the brine temperature willrise at approximately the same rate as the water-temperature falls.

In order to partly refrigerate the compartment 31 in which the syrup dispensers are located, a thermo-Siphon l-oop consisting of pipes 96, 97, 98 and 99 extends `from the upper portion of auxiliary pipe 21 and leads back. thereinto.

The return pipe 99 ofthis.

siphon loo through this loop in the'direction of the ar l consisting of the supply thermo-Siphon loop is positioned 'closely adjacent to the return conduit 49 leading from the pump back to tank 10. In the example here shown, thesev two pipes 99 and 49 are bound together by a wire or other connection indicated at 99a. Under normal conditions, when brine is not being supplied to the auxiliary tank 21, the brine flowing 'through return pipe 49will be at substantially the low temperature of the brine in tank 10, and will thus serve to chill or lower the temperature of the brine in leg 99 of the thermoso as to insure a flow of brine rows.

In the general operation of the soda fountain disclosed in Fig. 1, the control valve 15 will be adjusted so as to cause the boiler 12 lto maintain the brine in the main tank at the desired low temperature. The pump 33 will cause a practically continuous How of liquid from tank 10 and through the return conduit 49 to the upper portion of tank 10. This serves to keep the brine in circulation and prevent settling out of 'the salts, and also serves to chill the return leg of the thermo-siphon loop for the syrup compartment. Ordinarilythe valve 39 will belowered so that there-will be no flow of brine through conduit 50 into the secondary tank 16, but at intervals this valve will be raised in response to the action of thermostat 53 so as to supply a quantity of additional cold brine to this tank. vIn a similar manner, and as already described, the other valve 38 will be periodically opened and closed to admit colder brine to auxiliary tank 21, .in response to the net A or cumulative temperature changes in the brine in this tank and also in the liquid withn the coolers 28 and 24. After the thermostatic elements have been properly set orl ad- 'justed, 'fthe action is entirely automatic throughout the fountain.

As has been' previously noted, the auxiliary tank 21 will be comparatively small so as to permita'rapid change in the temperature of the brine` therein, and this has the additional benefit of enlarging' the space available for the storagecompartment 22. It'should -be noted that although in the drawings a large lportion of this compartment 22 is apparently occupied by. the" valves and other .mechai nism that are diagrammatically illustrated,

in the actual installation these parts occupy a -relatively7`small space and nearly all of comartment 22 is available for the stty rage of goods that are to'be refrigerated.

In the simplified forni of the invention shown in Figa-7,A thel brine 'pump is omit-ted,

. and the auxiliary tank 21. is connected with 'main brine tank 10 by a thermo-Siphon loop pipe 100 and return pipe 101. -Cut-oif valve 102 controlled byV solenoid 103 is positioned in one of these pipes or' conduits so as to control the iiowofv brine therethrough, and this valve is controlled by the thermostatically operated switch mechanism which may be the same as that disclosed in Figs. 1, 2 and 3.

The modification shown in Fig. 8 is substantially the same as that shown-in Fig. 7, except that a motor-drivenpulnp 104 1s substituted for the valve 102. When a motoractuating circuit is completed by the thermostatical'ly operated switch mechanism, brine will be drawn from tank 10 into auxiliary tank 2l through pipe 105, `and the warmer brine will be returned to tank 10 through pipe 106. It will be noted that pipes 105 and 106 enter tank 10 at substantially the same level to avoid thermo-Siphon action. The discharge pipe 106 may be continued upwardly at 107 within tank 10 "to secure the desired circulation of brine within this tank.

auxiliary brine tank -108 which contains the coolers is not connected .with the main brine tank 10 for circulation .of brine therefrom,

in response to temperature'changes in the coolers and auxiliarybrine tank 108, in exactly the same manner as in .the previously described modifications. In this form of the linvention the temperature of the brine in auxiliary tank 108 is regulated by controlling the refrigerating unit `109 placed therein, this temperature control being quite independentv of the temperature of the brine in main tank 10 auxiliary tank 114 is provided with its own boiler orrefrigerating element 115 supplied with refrigerating medium through pipe 112y controlled by valve 113, all as in Fig. 9. In this apparatus the control circuit for operating the valve 113 is controlled by two entirely separate thermostatically controlled switches` one of which 116 is controlled from a bulb 117 placed in one or both of the coolers, and the other 118 is controlled from a-bulb 119 in the brine tank. v- The two switches 116 and 118 are set to close at different temperatures, for example the switch 116 will close when the temperature of the liquid in the coolers to which bulb 117 is exposed has risen to 40 Fahrenheit, whereas switch 118 will close .when the temperature of the lbrine reaches 33 Fahrenheit. In-this-way, the boiler 115 will be caused to function when either the brine In the modification shown in Fig. 9, the-r B5 v n. l In the modification shown in Fig. 10, the

or the liquid inthe coolers has risenabove l certain determined temperatures, the brine maintained considerably colder V always being brine is never permitted to rise above ateni- 'switch 116 will close to cause the boiler .to

function and lower the brine considerably ,he-

` low its norma-l working temperature until the temperature of the cooled liquidhas again been lowered below the permitted maximum.

' In order to have the modification function rapidly and efficiently, it is'desirable that the volume of brine used be comparatively small.

For this reason the coolers are' here shown kof rectangular cross-section to increase their volume relative to tank 114 and are enclosed withinv the coils of boiler 115. The volume of liquid in the coolers may be approximately the same as the volume of brine in tank 114. It might even be possible to operate this form of apparatus without using brine, the bulb 11.9 registering thetemperatln'e ofthe boiler coils. As has already been pointed out, other refrigerating elements than the so-called boilers here illustrated might be employed for maintaining the original cold temperatureof the brine in the main tank, or in the auxiliary tank when direct control of the temperature of the brine therein is used. In tho fclaims which follow, the term boiler is inthe term` brine is here used by way of example and. is intended to cover any equivalent form of temperature controlled llq'uid.

The several tanks and other individual features of the fountain are not all shown in `their 'true sizes or relative proportions in mat1c.

I claim:

the drawings which are largely diagram- 1. In arefrigerating apparatus of the character described, a-cooler for a iluid, a tank containing brine in which this cooler is immersed, and means for varying the temperature of the brine comprising thermostatic mechanism responsive to the temperatures of both the-.fluid inthe cooler and the brine .in the tank. l' 2. In a refrigerating apparatus of the character describedya coolerfor a fluid, a tank containing brine in which this cooler is immersed, and means for varyingthe temperature of the brine comprising thermostat- 1c mechanism responsive simultaneously and cumulatively to the temperatures of the fluid inthe cooler and thebrine in the tank.

l l tank containing brine in which -this cooler' 3. In a refrigerating apparatus of 'the character described, a coolerfor a fluid, a

isimmersed, a source of cold brine at a. substantially constant temperature, and means for controlling the flow -of cold brine from this source into the tank comprising thermostatic mechanism responsive simultaneously and cumulatively to the temperatures of the fluid in the cooler and the brine in the tank.

4, In a refrigerating vapparatus 'of the character described, a main brine tank, a

in both the auxiliary tank and in the cooler for opening, and closing the valve.

5. In a refrigerating apparatus of the character described, a main brine tank, a boiler therein, an auxiliary tank, a cooler for liquid positioned in the auxiliary tank, a conduit for conducting brin'e from the main tank to the auxiliary tank, a valve in this conduit, a return conduit connecting the tanks, a solenoid foi-'opening and closing the valve, a switch in the solenoid circuit, and thern'lostatic means in both the auxiliary tank and cooler to operate the switch in. response to simultaneous and cumulative changes in the auxiliary tank and cooler.

6. In a refrigerating apparatus of the character described, a main brine tank, an auxiliary tank, a cooler for liquid positioned in the auxiliary tank, a conduit for conducting brine from the main tank to the auxiliary tank, a valve in this conduit, a return'conduit connecting the tanks, thermostatic means comprising a bulb in the auxiliary tank, a.

'bulb in the cooler, and an expansible and contractible actuating member, the bulbs and member beinginterconnected and containing an expansible fluid, and means actuated by the member for operating the valve.

7. In a refrigerating apparatus of the character described, a main brine tank, a boiler therein, an auxiliary tank, a cooler for a liquid positioned in the auxiliary tank, a twoway valve, a conduit leading from the main tank to the valve, a return conduit having branches leading from the auxiliary tank and from the valve to the main tank,- a supply conduit leading from the valve to the auxiliary tank, a pump in the first mentioned contank to the valve, a return conduithaving branches leading from the auxiliary tank and from the-valve to the main tank, a supply conduit leading from the valve to the auxiliary tank, a pump-in the first mentioned conduit for forcing brine from the 'main tank, through 'the conduits, thermostatic means comprising a pairof bulbs and an expansible and contractible member Whichare interconated by the expansible member for operating v the return conduit where y the temperature'v i main tank to the valve, a return conduit hav- I nected and contain an expansible fluid, one bulb being positioned in tlieauxiliary tank and the other in the cooler,l and means actuthe valve. 10. In a refrigerating apparatus of the .character described, amain brine tank, la

boiler therein, an auxiliary tank, a cooler for a liquid positioned in the auxiliary tank, a twoway valve, a conduit leading from the main tank to the valve, a return conduit having branches leading from the auxiliary tank and from vthe valve to the main tank, a supply conduit leading from the valve Yto the auxil iary tank, a pump in the first mentioned conduit for forcing brine from the main tankthrough the, conduits, means responsive to temperature-changes in both the auxiliary,

tank and the cooler for operating the valve, and'a thermo-Siphon coil leading from the auxiliary tank and returning thereto, a portion of this coil being ositioned adjacent of the brine in this portion'of the coil will be affected by the temperature of the brine in this return conduit.v

11. In a refrigerating apparatus oi the' character described, a main brine tank, a

boilertherein, an'a'uxiliary tank, a cooler for a liquid positioned in the auxiliary tank, a two-way valve, a` conduit leading from the ing branches leading'from the auxiliary tank and from the valve to the main. tank, a. supply conduit leading -from the valve to the auxiliary tank, a pump in the first mentioned Yconduit for forcing brine from the main tank through the conduits, thermostatic means comprising a pair of bulbs and an expansible and contractible member which are inter-connected and contain an expansible uid, one' bulbbeing positioned in the auxil- 1 iary tank andthe other in thecooler, means actuated by the expansible member for operatin the valve, and a thermo-Siphon coil leading from theauxiliary tank and reliirning thereto, a portion of this coil'bein posithe temperature of the brine in this portion -of the coil will be aii'ected by the temperature of the brine in .this return conduit.

12. In a refrigerating apparatus of the vcharacter described, a main brine tank, a

boiler therein, a second brine tank positioned adjacent the main tank and having' an open return flow connection therewith, an auxiliary tank, a cooler for liquids inthe auxiliary -tioned adjacent the return conduit w ercby l tank,a pair of two-Way valves, a supply conduit leading from the main tank-and having branches leading to the respective valves, a

pgump in this conduit'for withdrawing brine om the main tank and .forcing it to and through the valves, a return conduit having branches leading from each valve and from the auxiliary tank for returning brine to the -main tank, a conduit leading from one valve to 'the second tank, a conduit leading from the othervalve to the auxiliary tank, thermostatic-means responsive to the temperature valve, and thermostatic mean/s responsive to changes in the temperature, in'both the auxilinthe second tank for controllingthe first'4 i iary tank and cooler for operating the second 13. In a. reffrigeratingy apparatus oi the character described, a main brine tank, a

boiler therein, a second brine tank positioned adjacent the main tank and having anopen iary tank, a cooler for liquids in the auxiliary return flow connectin therewith, an auxiltank, a pair of two-.w y valves, a supply conduit vlleading from the main tank and having branches leading to the respective valves,

a pumpv in.l this conduit for withdrawing brine from the main tank and forcing it to and through the valves, a return conduit having 'branches leading from each valve and from the' auxiliarytank for returning brine to the main tank, aconduit leading from one valve to the second tank, a conduit leading from the othervalve to the auxiliary tank, thermostatic'means responsive to the temperature in the second tank for .controlling thefirst valve, and thermostatic means comprising a bulb in the auxiliary tank, a bulb in the cooler, and means actuated by vthe, joint action of the expansion and contraction of an expansible iuid in these bulbs for operating the second walve,

14. In a refrigerating apparatus of the character described, a main brine tank, a

12'.) I boiler therein, a second brine tank positioned Vadj acent the main tank and-[having an Open return-flow connection therewith, an auxil- .iary tank, a cooler for liquids in theauxiliary tank, a pair of two-way valves, a supply conduit leading from the main tank and having branches leading to .the respective valves, a pump in this conduit for withdrawing brine from the main tankgand forcin it to and through the valves, a .return con uit having.

branches leading from' each valve and from the auxiliary tank for returning brine to the main tank, a thermosiphon coil leading from the auxliary tank and back thereto and having` a portion thereof positioned adjacent the return conduit whereby the temperature of the brine in this portion of the coil will be affected by the temperature of the brine in the return conduit, a conduit leading from one valve to the second tank, a conduit leading from the other valve to the auxiliary tank, thermostatc means responsive to the temperature in the second tank for ,controlling the rst valve, and thermostatic means comprising a bulb in the auxiliary tank, a

' bulb in the`cooler,and means actuated by the joint action of the expansion and contraction of an expansible-luid in these bulbs for-operating the second valve.

15. Iii a ref rigerating apparatus of the character described, a brine tank, a boiler therein, an auxiliary brine tank, a boiler therein` a cooler in the auxiliary tank, a conduit for refrigerating medium having branches leading to the respective boilers, a

valve in the branch leading to the auxiliary tank, and thermostatic means responsive to changes in the temperatures in both the auxiliary tank and cooler for operatingv the valve. o 16. In a refrigerating .apparatus of the character described, a tank, means for circulating a cooling fluid into and out of the tank, a valve in this circulating means, a cooler for liquid positioned in the tank, and thermo- -static. means responsive to the combined temv perature changes in both the cooler and tank for operating the valve. v

Y 17. In a refrigerating apparatus of the to be subjected to the temperature of the brine in the main tank.

2O.y In a refrigerating apparatus, a main brine tank, a boiler therein, an auxiliary tank, means for intermitte tly circulating brine from the-main tank t rough the auxiliary tank, a thermo-Siphon cooling loop leading from and'back to the auxiliary tank, and means for circulating brine at the temperature of the brine in the mam tank in close proximity lto the .return leg of the thermo- Siphon loop.

21. In apparatus for cooling a. Huid to a predetermined temperature, la cooling bath, a. cooler located in said `bath through which theluid to be cooled flows, and thermostatically controlled means for lowering the temperature'of the cooling bath as the temperature of the fluid inthe cooler rises above the predetermined temperature, said thermostatic means being''responsive to temperature changes in the bath and also temperature .changes in the fluid in the cooler.

FRED I. RAYMOND.

character described, a tank, means for circulating a cooling fluid into andout of the tank, a valve in this circulating means, a cooler for liquid positioned in the tank, and thermostatic means comprising abulb 1n the cooler, a bulb in the tank and means actuatedby the combined expansion or contraction of a fluid in the two bulbs for actuating the valve."` l l 18. In a refrigerating apparatus 'of the character described, a brine tank, a boiler therein, a conduit for-supplying actuatingA luid to the boiler, a-valvein'this conduit, a

ing the valve.

cooler fdr liquid positioned in saidltank, and A thermostaticmeans responsive simultaneously to the changesin temperature of both 'the' brine and the liquid in the cooler for'actuatbrine tank, a boiler therein, an aum'liary tank,

means for intermittently circulating brine from the main tank through the auxiliary' tank, and a thermo-Siphon cooling loop leadmg from and 'back to the auxiliary tank, the return leg of this loop being' so positioned aS 

